A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : SCTP Tail Loss Recovery Enhancements
Author : Karen E. E. Nielsen
Filename : draft-nielsen-tsvwg-sctp-tlr-01.txt
Pages : 18
Date : 2014-11-11
Abstract:
Loss Recovery by means of T3-Retransmission has significant
detrimental impact on the delays experienced through an SCTP
association. The throughput achievable over an SCTP association also
is negatively impacted by the occurence of T3-Retransmissions. Loss
Recovery by Fast Retransmission operation is in most situations
superior to T3-Retransmission from a latency and a throughput
perspective. The present SCTP Fast Recovery algorithms as specified
by [RFC4960] are not able to adequately or timely recover losses in
certain situations, thus resorting to loss recovery by lengthy
T3-Retransimissions or by non-timely activation of Fast Recovery. In
this document we propose for a number of enhancements to the SCTP
Loss Recovery algorithms aimed to amend some of these deficiencies
with a particular focus on Loss Recovery for drops in Traffic Tails.
The enhancements supplement the existing algorithms of [RFC4960] with
proactive probing and timer driven activation of the Fast
Retransmission algorithm as well as a number of enhancements of the
Fast Retransmission algorithm in itself are proposed. The
enhancement are proposed as supplements to the Loss Recovery
algorithms of [RFC4960] and as such they do not deprecate or replace
any of the mechanisms defined by [RFC4960].
The solution proposed draws on prior art in the area of SCTP and TCP
Loss Recovery improvements. The mechanisms proposed include the
adjustment to SCTP Fast Retransmission of certain improvements
specified for TCP Fast Retransmission by [RFC6675] as well as the
proposal embeds SCTP Early Retransmit [RFC5827] in a delayed variant.
The proposal heavily draws on the ideas put forward for TCP by
[DUKKIPATI01] for proactive probing and timer driven entering of Fast
Recovery. The proposal embeds certain aspects from [HURTIG] when
applicable. The procedures proposed are sender-side only and do not
impact the SCTP receiver.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-nielsen-tsvwg-sctp-tlr/
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-nielsen-tsvwg-sctp-tlr-01
A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-nielsen-tsvwg-sctp-tlr-01
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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